{"id":738,"date":"2025-05-09T05:46:22","date_gmt":"2025-05-09T10:46:22","guid":{"rendered":"https:\/\/stagefoursecurity.com\/blog\/?p=738"},"modified":"2025-05-09T03:34:14","modified_gmt":"2025-05-09T08:34:14","slug":"rainbow-series-legacy","status":"publish","type":"post","link":"https:\/\/stagefoursecurity.com\/blog\/2025\/05\/09\/rainbow-series-legacy\/","title":{"rendered":"Rainbow Series Legacy"},"content":{"rendered":"<article>\n<header>\n<h1>\ud83c\udf08 The Rainbow Series and the Rise of Formal Security Policy<\/h1>\n<p><em>By James K. Bishop, vCISO | Founder, <a href=\"https:\/\/stagefoursecurity.com\" target=\"_blank\" rel=\"noopener\">Stage Four Security<\/a><\/em><\/p>\n<\/header>\n<section><a href=\"https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/The-Rainbow-Series.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"alignright wp-image-757\" src=\"https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/The-Rainbow-Series-300x200.png\" alt=\"\" width=\"400\" height=\"267\" srcset=\"https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/The-Rainbow-Series-300x200.png 300w, https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/The-Rainbow-Series-1024x683.png 1024w, https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/The-Rainbow-Series-768x512.png 768w, https:\/\/stagefoursecurity.com\/blog\/wp-content\/uploads\/2025\/05\/The-Rainbow-Series.png 1536w\" sizes=\"(max-width: 400px) 100vw, 400px\" \/><\/a>In the 1980s and 1990s, securing computer systems meant more than antivirus and firewalls. It meant proving\u2014on paper and in practice\u2014that your system could enforce policy. The <strong>Rainbow Series<\/strong>, a set of color-coded books published by the U.S. DoD\u2019s National Computer Security Center (NCSC), became the playbook for doing exactly that.<\/p>\n<p>This post examines what the Rainbow Series was, how it influenced technical and policy development, and why its legacy lives on in today\u2019s evaluation standards like Common Criteria and FedRAMP.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\udcd8 What Was the Rainbow Series?<\/h2>\n<ul>\n<li><strong>Authoring agency:<\/strong> NCSC, part of the NSA<\/li>\n<li><strong>Timeframe:<\/strong> Early 1980s to mid-1990s<\/li>\n<li><strong>Purpose:<\/strong> Define and standardize the evaluation of trusted computer systems used in military and government environments<\/li>\n<li><strong>Total volumes:<\/strong> Over 30 documents, each named for the color of its cover<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2>\ud83d\udcd5 The Orange Book (1983): The Cornerstone<\/h2>\n<p>Officially titled the <strong>Trusted Computer System Evaluation Criteria (TCSEC)<\/strong>, the Orange Book defined the core idea of a \u201ctrusted system.\u201d It specified technical requirements, design architectures, and assurance levels used to evaluate systems.<\/p>\n<h3>\ud83d\udd12 Key Features<\/h3>\n<ul>\n<li><strong>Security levels:<\/strong> From D (minimal) to A1 (verified design), with progressively stricter requirements<\/li>\n<li><strong>Mandatory and discretionary access control (MAC\/DAC):<\/strong> Required systems to control access based on policy\u2014not just user discretion<\/li>\n<li><strong>Auditing and accountability:<\/strong> Insisted on event logging and traceability for all security-relevant actions<\/li>\n<li><strong>Trusted computing base (TCB):<\/strong> Defined the smallest set of components responsible for enforcing security policy<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2>\ud83d\udcd9\ud83d\udcd7\ud83d\udcd2 Notable Companion Volumes<\/h2>\n<ul>\n<li><strong>Red Book (1987):<\/strong> Trusted Network Interpretation\u2014how to apply TCSEC in distributed networked systems<\/li>\n<li><strong>Green Book:<\/strong> Password management and authentication standards<\/li>\n<li><strong>Tan Book:<\/strong> Audit and accountability principles<\/li>\n<li><strong>Purple Book:<\/strong> Formal verification of software security properties<\/li>\n<\/ul>\n<p>These volumes created a shared vocabulary and methodology for both vendors and evaluators\u2014and laid the groundwork for commercial security certification programs.<\/p>\n<\/section>\n<section>\n<h2>\ud83d\udd0d Legacy and Modern Relevance<\/h2>\n<ul>\n<li><strong>Common Criteria:<\/strong> Direct descendant of the Orange Book; provides global system evaluation standards for government and defense<\/li>\n<li><strong>FedRAMP and NIST SP 800-53:<\/strong> Borrow heavily from Rainbow Series principles\u2014especially in control families and auditability<\/li>\n<li><strong>DoD ATO process:<\/strong> Authorization to Operate processes in U.S. military systems still map back to Rainbow-era assurance models<\/li>\n<li><strong>Secure development:<\/strong> Formal design, threat modeling, and least privilege principles first appeared in these books<\/li>\n<\/ul>\n<\/section>\n<section>\n<h2>\ud83d\udce3 Final Thought<\/h2>\n<p>The Rainbow Series gave cybersecurity its first real doctrine\u2014a structured way to define, build, and evaluate secure systems. While technology has evolved, many of today\u2019s trust frameworks, compliance standards, and security architectures trace their roots to these colorful pages. If you\u2019ve ever filled out a control matrix, chased an ATO, or deployed SELinux, you\u2019re following a path that began with the Orange Book.<\/p>\n<p><strong>Need help aligning your architecture or compliance strategy to trusted security models?<\/strong> <a href=\"https:\/\/stagefoursecurity.com\/blog\/partner-with-stage-four-security\/\" target=\"_blank\" rel=\"noopener\">Let\u2019s talk<\/a>.<\/p>\n<\/section>\n<\/article>\n","protected":false},"excerpt":{"rendered":"<p>\ud83c\udf08 The Rainbow Series and the Rise of Formal Security Policy By James K. Bishop, vCISO | Founder, Stage Four [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[27],"tags":[],"class_list":["post-738","post","type-post","status-publish","format-standard","hentry","category-security-origins"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - 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